ok so i have been having trouble with cruising speed at around 2500 rpm, finally after searching and scratching my head forever, i saw that the o2 sensor is going up and down from about 85 to 0 and everything inbetween on the commander right along with my cars performance. Ok, i dont have an airpump, so can i just eliminate the o2 sensor or something, what do i need to do without buying a datalog thanks

 

The closed-loop is working as it should, the feedback setting just needs to be adjusted in the PFC a little. Also, you can just disable the closed-loop by going under the Function menu and turning it off. RTFM.

 

so should i just adjust the settings instead of disabling, sorry if this should be in pfc section,

 

You could try to adjust them first...but I'm fairly sure you need the Datalogit to make the adjustment. Better to just disable it for the time being.

 

Disable it, I found the PFC O2 feedback to be very picky and I if tuned right you can get way better mpg than just running the base fuel maps with closed loop. I recall after lots of mods and tuning that the damn closed loop would start happening at very low rpm/speeds as is typical of parking lot situations, the car would start bucking like hell and it wasn't but a few minutes later that O2 F/B was turned off and never used again on my car.

Perhaps Rynberg or Chuck still care about closed loop and have some advice on the setting to use but I just decided to tune for economy without it years ago and don't care to go back.